Installment Payment Receivables, Net - Summary of sales type lease net investment in lease before allowance or credit loss (Detail) - Vehicles and Batteries [Member] - CNY (¥) ¥ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Sales-Type Lease, Net Investment in Lease, before Allowance for Credit Loss, Alternative [Abstract] | ||
| Current portion of installment payment receivables, net | ¥ 3,553,054 | ¥ 2,558,756 |
| Non-current portion of installment payment receivables, net | 6,496,020 | 4,448,416 |
| Total | ¥ 10,049,074 | ¥ 7,007,172 |